i need new tires

[avance70]

ive got renault clio 1.2
and 155/70 R13 tires

so correct me if im wrong:

1)wider tires do:
-improve handling
-improve braking
-degrade acceleration
-degrade top speed
-degrade mpg

2)shorter tires do
-improve acceleration
-improve top speed
-improve mpg
-degrade handling
-degrade braking

so i plan just to get wider tires like say: DUNLOP SP2000 which are 205/50 R13
can i just fit these on my car or do i need some modifications?
are these too wide?

and... any other suggestions?

[avance70]

thanks i just bought "sava" 155/70 R13 (clio 1.2 regular)
picture here : www.reifen.de/sava/effecta_-/155-70_r13_75t.html
i chose this brand because its produced here and its quite cheap... and hey, its a great tire i say!